In this panel, Chapman explains that the sound of eating of "chomp" to English-speakers have various foreign language equivalents (cross-linguistic onomatopoeias, if you want to be technical), including "paku paku" in Japanese, "chrup chrup" in Polish, "nyam" in Korean, "miam" in French - and my favorite, "mampf" in German.

If your language is not in the comic, do tell us what eating sounds like in your native tongue.